Normal Electrocardiogram Lecture Objectives
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Questions and Answers

The electrocardiogram (ECG) records the mechanical activity of the heart on special paper.

False

ECG stands for Electrocardiograph, not Electrocardiogram.

False

The contraction and relaxation of cardiac muscle is a result of hyperpolarization and depolarization of myocardial cells.

False

The 12-lead ECG is composed of two lead systems: standard limb leads and chest leads.

<p>False</p> Signup and view all the answers

The electrodes pick up electrical forces from the surface of the body and record them in the form of an ECG.

<p>True</p> Signup and view all the answers

The 12-lead ECG includes limb leads I, II, III, aVR, aVL, and aVF.

<p>True</p> Signup and view all the answers

Precordial leads are obtained from electrodes placed on the chest in designated areas.

<p>True</p> Signup and view all the answers

The ECG paper speed is usually 50 mm/sec.

<p>False</p> Signup and view all the answers

The standard calibration on ECG paper is 5 mm (5 small boxes) equal to 1 mV.

<p>False</p> Signup and view all the answers

The QRS complex represents the repolarization of the ventricles.

<p>False</p> Signup and view all the answers

In standard limb leads, one limb carries a negative electrode and the other limb carries a positive electrode.

<p>False</p> Signup and view all the answers

Augmented limb leads are also called bipolar leads.

<p>False</p> Signup and view all the answers

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